One more question. Suppose the problem caused any stale vnic on any vm, previously atached on OVN, is there a way to see at db level?

Currently I only have 4 VMs and "network interfaces" in web admin gui doesn't show any OVN, but I would like to crosscheck also at db level, because I think in previous config before doing damages I has some on OVN.

select iface.name, n.name from vm_interface as iface left join vnic_profiles as vnic on iface.vnic_profile_id = vnic.id left join network n on vnic.network_id = n.id where n.provider_network_external_id is not null
 

A bit longer but should show you the ovn network name that might be attached to the VM.

Hopefully this helps